Item1572: Error using Configure -> 'Find More Extensions' after installing GaugePlugin

Priority:	CurrentState:	AppliesTo:	Component:	WaitingFor:
Normal	Closed	Engine	Configure

Error Output

Use of uninitialized value in pattern match (m//) at /data/foswiki/lib/Foswiki/Configure/UIs/EXTENSIONS.pm line 160.

Summary

It was long since I upgraded our wiki. We moved from TWiki 4.1.3 to 4.3.0. After the upgrade I searched for 'Best of Twiki' in Google. That's how I came to know about the Fork. I appraised my seniors about this and we decided to go with FOS. So I am here upgrading my wiki from TWiki 4.3.0 to Foswiki 1.0.5.

How to Recreate it

• On the configure page click on 'Find More Extensions' button for installing plugins.
• Installed ChartPlugin and it works fine.
• Installed GaugePlugin and it worked fine.
• After that when I click on 'Find More Extensions', I get the above error.

Steps taken to Correct

• Went to the root directory of the wiki.
• Manually uninstalled it by running the Gauge_installer script with 'uninstall' parameter.
• After that browsed the configure page and clicked on 'Find More Extensions' and it displayed the list of extensions. It worked fine.

Observation & Suggestions

• It looks like the error was caused by GaugePlugin. However I don't have any definite data to prove this.
• On a different thread, it would be great if there was an option from the front end(browser - configure page) to uninstall plugins.

---

I have come across this also, The cause I have found is the description in the extension feed at http://foswiki.org/Extensions/FastReport?skin=text, it contains '}' which closes the record too early and the version value isn't being populated.

{ topic: GaugePlugin
 description:  Build dashboards that contain graphical images of gauges defined with =%GAUGE{}%= variables.
 compatibility: Foswiki >= 1.0
 classification: Interface and Visualisation
 version: 3178 (2009-03-18) 
 }

My fix was to modify the regex to specify a newline and some whitespace before the closing bracket {(.*?)\n\s+}, which works for this case:

--- lib/Foswiki/Configure/UIs/EXTENSIONS.pm     2009-05-08 14:38:03.000000000 +1000
+++ lib/Foswiki/Configure/UIs/EXTENSIONS.pm.orig    2009-03-20 07:17:12.000000000 +1100
@@ -50,7 +50,7 @@
             my $response = $this->getUrl($url);
             if ( !$response->is_error() ) {
                 my $page = $response->content();
-                $page =~ s/{(.*?)\n\s+}/$this->_parseRow($1, $place)/ges;
+                $page =~ s/{(.*?)}/$this->_parseRow($1, $place)/ges;
             }
             else {
                 push(

-- SimonHarrison - 08 May 2009

I don't see an error with 1.0.7 or 1.1, though the short description is incorrect. I have fixed it using a method simiar to the one Simon suggests.

-- CrawfordCurrie - 20 Sep 2009